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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fd6a8b77416c32e63b274a588fa872b0b262e37f0d2db9156438ea8e659f137' 
  AND token = 'MsJoyf7s/+Lome4HVRgNaU2/B/d2syH3PYKabpQ6ayQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}